Filter.



PATENTED APR. l0, 1906.

G. M. KNEUPER.

FILTER.

APPLICATION FILED No1/.3o. 1904.

UNITED sTATEs PATENT oEEIoE.'

GEORGE M. KNEUPER, @F NEW YORK, N. Y;

, Farr-1n.

Specification of Letters Patent.

Patented April 1o, 190e.

Application led November 30, 1904. Serial No. 234,858..

Filters,` of which the following is a specifica* tion.

My invention relates to filters, and has for its object to provide an extremely efficient filter; and it consists more particularly in a new filtering material which can be made in the form of sheets to be wrapped around a suitable holder,

The characteristics and advantages'of the invention will be fully set forth hereinafterl and the features of noveltypointed out in the appended claims.

Reference is to be had to the accompanying drawings, in which Figure 1 1s a face view of my im roved filtering material with a portion bro ren away. Fig. 2 is afpartial cross-section on line 2 2 of Fig. 1.` Flg. 8 shows the newfiltering material in substantially its wrapped condition, and Fig. 4 is a sectional elevation of a complete filter embodying my invention.

I employ suitable flexible porous carrier A, such as a sheet of cotton batting, upon one side of which and preferably only on about one-half of that surface I apply a coating B, containing a filtering substance. This coating may consist, for instance, of calcium phosphate, twelve parts, by weight; charcoal,

twelve parts, by weight; gum-tragacanth, one y part, by weight. In theother half of the other side of the carrier A, I may apply one,

,two, or more layers (l of a fiexib e porous material of a closer texture than the carrier A-for lnstance, paper.

In uslng the filtering material prepared as above described I may, for instance, take a perforated cylinder D, made of sheet metal and of a length somewhat smaller than the wid th of the sheet or carrier A, and on thls cylinder I wrap the sheet, beginning with that portion on which the coating B has been applied. The sheet should be of such length as to go around the cylinder D at least l twice, as has been shown in Fig'S. As a result of this, the coating B, containing the filtering substance, will he against the paper or other material C, it being understood that to have the coating B on the outside of .the

the sheet are then folded inward, as shown in Fig. 4, and the structure, consisting of the cylinder D with the filtering material wrapped around it, isput into another perforated c linder E, which is of greater diametcrthan tffe cylinder D and also slightly longer. The cylinders are then fastened between two heads I*w F, as by means of a nut G', fitting on a screw-threaded portion of the pipe G', which passes loosely through the head lf and is fastened in head F. The body portion of the pipe G is perforated, as shown, so as to allow the liquid to be filtered to be introduced and forced into the central chamber surrounded bythe cylinder D. 'Ihe liquid then passes out through the filtering material and the cylinders D E and is collected and led off in any suitable 1nanner-for instance, by letting it run down a guide H. Durlng the passage of the liquid the coating B 1s partially or entirely transferred from the outer surface of the first layer of the 'filtering material to the inner surface of the second layer-that is, to the paper C in case such paper is used. The gum-tragacanth being' a soluble substance is graduallycarried away; but this is without effect on the filtering. action, since said gum is used only as an initial binder.

My improved filtering materiai will remain efficient for a very long time and may then, ll' desired, be cleaned, as by brushing it; but in most cases it will be found more convenient to simply discard the spent filtering maternl and substitute a new sheet.

What I claim, and desirey to secure by l.ot ters Patent, is-

1. A filtering material consisting of a vporous flexible carrier,.which on one hall' oll one of its surfaces, is providedwith a coating containing afiltcring substance, and on the other half of the other surface is provided with a the sheet is so wrapped on the cylinder D asv first layer. The projecting edge portions of` porous flexible material of greater density than the carrier proper.

' 2. A ltering material consisting of 'a porous flexible carrier, coated with a compound containing Charcoal and gum-tragacanth.

3. A filtering material consisting of a porous, exible carrier A, coated on -one half only of one surface with a compound B containing a i'iltering substance and adapted when coiled to have the carrier A embrace 1o the compound B onboth sides.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses. GEORGE M. KNEUPER. Witnesses:

" 'JOHN LOTKA,

JOHN A. KEBLENBEOK. 

